linux-kernel - [PATCH v2 06/13] phy: qcom-qmp-usb: clean up device-tree parsing

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Message-Id: <20221028134407.19300-7-johan+linaro@kernel.org>
Date:   Fri, 28 Oct 2022 15:44:00 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH v2 06/13] phy: qcom-qmp-usb: clean up device-tree parsing

Since the QMP driver split there will be at most a single child node so
drop the obsolete iteration construct.

While at it, drop the verbose error logging that would have been
printed also on probe deferrals.

Note that there's no need to check if there are additional child nodes
(the kernel is not a devicetree validator), but let's return an error if
there are no child nodes at all for now.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp-usb.c | 40 ++++++++-----------------
 1 file changed, 12 insertions(+), 28 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
index e009d63260e7..ccb834a08d5b 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
@@ -2471,7 +2471,6 @@ static int qmp_usb_probe(struct platform_device *pdev)
 	void __iomem *serdes;
 	const struct qmp_phy_cfg *cfg = NULL;
 	struct qmp_usb *qmp;
-	int num, id;
 	int ret;
 
 	qmp = devm_kzalloc(dev, sizeof(*qmp), GFP_KERNEL);
@@ -2507,44 +2506,29 @@ static int qmp_usb_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	num = of_get_available_child_count(dev->of_node);
-	/* do we have a rogue child node ? */
-	if (num > 1)
+	child = of_get_next_available_child(dev->of_node, NULL);
+	if (!child)
 		return -EINVAL;
 
 	pm_runtime_set_active(dev);
 	ret = devm_pm_runtime_enable(dev);
 	if (ret)
-		return ret;
+		goto err_node_put;
 	/*
 	 * Prevent runtime pm from being ON by default. Users can enable
 	 * it using power/control in sysfs.
 	 */
 	pm_runtime_forbid(dev);
 
-	id = 0;
-	for_each_available_child_of_node(dev->of_node, child) {
-		/* Create per-lane phy */
-		ret = qmp_usb_create(dev, child, serdes, cfg);
-		if (ret) {
-			dev_err(dev, "failed to create lane%d phy, %d\n",
-				id, ret);
-			goto err_node_put;
-		}
-
-		/*
-		 * Register the pipe clock provided by phy.
-		 * See function description to see details of this pipe clock.
-		 */
-		ret = phy_pipe_clk_register(qmp, child);
-		if (ret) {
-			dev_err(qmp->dev,
-				"failed to register pipe clock source\n");
-			goto err_node_put;
-		}
-
-		id++;
-	}
+	ret = qmp_usb_create(dev, child, serdes, cfg);
+	if (ret)
+		goto err_node_put;
+
+	ret = phy_pipe_clk_register(qmp, child);
+	if (ret)
+		goto err_node_put;
+
+	of_node_put(child);
 
 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 
-- 
2.37.3